package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author: 廖卓斯
 * @CreateTime: 2024-10-23
 * @Description:
 * @Version: 1.0
 */

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties properties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());
        //2.判断openid是否为空 若为空登录失败 抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //3.若openid不为空，合法微信用户 -》
        // 判断是否为新用户（即是否存在于数据库的用户表）
        User user = userMapper.getByOpenId(openid);
        if (user == null) {
            //自动注册
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);

        }
        //4.是新用户——》自动注册

        //5.返回用户对象
        return user;
    }

    /**
     * 调用微信接口服务 获取openid
     *
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        //1.通过已包装的HttpClient(得到请求后返回的数据) 调用微信接口服务，获得当前微信用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", properties.getAppid());
        map.put("secret", properties.getSecret());
        map.put("grant_type", "authorization_code");
        map.put("js_code", code);
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //1.1解析数据 将json字符串转为json对象
        JSONObject jsonObject = JSON.parseObject(json);
        //1.2 根据jason的键得到值（String类型）
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
